From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vlad Yasevich <vyasevic@redhat.com>
Subject: Re: [PATCH] macvlan: Set IFF_UNICAST_FLT flag to prevent unnecessary
 promisc mode.
Date: Thu, 07 Mar 2013 15:32:26 -0500
Message-ID: <5138F95A.9010305@redhat.com>
References: <1362687708-8685-1-git-send-email-vyasevic@redhat.com> <5138F82F.6010005@candelatech.com>
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To: Ben Greear <greearb@candelatech.com>
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On 03/07/2013 03:27 PM, Ben Greear wrote:
> On 03/07/2013 12:21 PM, Vlad Yasevich wrote:
>> Macvlan already supports hw address filters.  Set the IFF_UNICAST_FLT
>> so that it doesn't needlesly enter PROMISC mode when macvlans are
>> stacked.
>
> Out of curiosity, how can stacking mac-vlans be useful?
>
> (You are stacking more macvlans on a base mac-vlan?)

Yep, and macvlans allows, but it looks like it only tries to detect a 2 
level stack.  I am not sure what the reason is.  Might be realated to 
vlan-to-vlan communication.

-vlad

>
> Thanks,
> Ben
>